HMT Ruby
| Name | HMT Ruby |
| Type | Navy Trawler
|
| GRT | 251 tons |
| Country |  British |
| Built | 1916
|
| Builder | Cochrane & Sons Ltd., Selby
|
| Operator | Royal Navy
|
| History | Pecae-time operator: Kingston Steam Trawling Co. Ltd., Hull
|
U-boat attacks on Navy Trawler Ruby
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 17 Oct 1917 | UC 79 (Werner Löwe) | Sunk | Torpedoed off Ushant. No survivors.
| 48.50N, 05.10W
|
|
| 18
|
| UC 79 fired a torpedo toward the steamer Polvena, which U 53 had torpedoed earlier in the day. UC 79’s torpedo struck Ruby, which was assisting Polvena, and not its intended target.
|
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